How to build a bandpass filter by using the butter function?

Hello,

I am trying to extract the mu suppression values from my dataset, which doesn't allow using EEGLab. I did most of the steps, but I need to add a bandpass filter and I am not sure how.

The frequency band I would need is 8-13, my sampling rate is 1000 and I was told I would need an order of between 8 and 10.

The MATLab documentations lists this example:

[A,B,C,D] = butter(10,[500 560]/750); d = designfilt('bandpassiir','FilterOrder',20, ... 'HalfPowerFrequency1',500,'HalfPowerFrequency2',560, ... 'SampleRate',1500);

However, I am not sure, what parameters I need to use for my case except for sampling rate and filter order. Also, it is not clear to me what is [A,B,C,D]. I would appreciate any input, I am new to EEG analysis and MATLAB.

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